CN214916000U

CN214916000U - Temperature adjusting device for dichloromethane reaction kettle

Info

Publication number: CN214916000U
Application number: CN202120194991.7U
Authority: CN
Inventors: 朱凯明
Original assignee: Quzhou Kaiwo Chemical Co ltd
Current assignee: Quzhou Kaiwo Chemical Co ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-11-30
Anticipated expiration: 2031-01-25

Abstract

The utility model discloses a temperature regulation device for dichloromethane reaction kettle, which belongs to the technical field of dichloromethane, and comprises a reaction kettle main body, wherein the reaction kettle main body comprises a reaction kettle outer shell and a reaction kettle inner shell, the upper surface of the reaction kettle main body is communicated with a feeding pipe with a valve, the lower surface of the reaction kettle main body is communicated with a discharging pipe with a throttle valve, the upper surface of the reaction kettle main body is fixedly provided with a motor, and an output shaft of the motor is fixedly connected with a rotating rod; through being provided with adjusting part, utilize the adjustable cold water capacity of inputing to the circulating water pipe of electric putter to can be convenient for adjust the temperature in the reation kettle main part, can open the inlet tube that has one-way choke valve two and close the inlet tube that has one-way choke valve two when water to normal atmospheric temperature, make the water in the circulating water pipe return again to the storage water tank in cool off with convenient subsequent cooling once more, easy operation, convenient to use.

Description

Temperature adjusting device for dichloromethane reaction kettle

Technical Field

The utility model belongs to the technical field of the dichloromethane, concretely relates to a temperature regulation apparatus for dichloromethane reation kettle.

Background

Methylene chloride is an organic substance of the formula CH2Cl2, a colorless transparent liquid with an ether-like pungent odor. Is slightly soluble in water, soluble in ethanol and ether, is a non-flammable low-boiling point solvent, is usually used for replacing flammable petroleum ether, ether and the like, and dichloromethane is mainly used in the fields of film production and medicine in China. Wherein the consumption for the production of the film accounts for 50 percent of the total consumption, the consumption of the film accounts for 20 percent of the total consumption in the aspect of medicine, the consumption of the cleaning agent and the chemical industry accounts for 20 percent of the total consumption, and the consumption of the film accounts for 10 percent of the other aspects. Methylene chloride is also used as a coolant in industrial refrigeration systems. And 35, 10 and 27 in 2017, preliminarily finishing and referring to a carcinogen list published by international cancer research institution of world health organization, wherein dichloromethane is in a class 2A carcinogen list. In 2019, 1 month and 23 days, the dichloromethane is listed in the list of toxic and harmful atmospheric pollutants in 2019, and in 7 months and 23 days in 2019, the dichloromethane is listed in the list of toxic and harmful water pollutants.

A reation kettle for preparing dichloromethane on the existing market, can't adjust the temperature in the reation kettle, make the high temperature or cross the low effect that all can influence the preparation of dichloromethane excessively, thereby reation kettle's work efficiency has been reduced, and current reation kettle for preparing dichloromethane is behind the preparation dichloromethane, contain volatilizing dichloromethane gas direct exposure in the air in the reation kettle, because dichloromethane gas itself has toxicity, can seriously influence operating personnel's life health, the danger coefficient has been promoted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a temperature regulation apparatus for dichloromethane reation kettle, with the reation kettle who is used for preparing dichloromethane on solving the present market that proposes in the above-mentioned background, can't adjust the temperature in the reation kettle, make the high temperature or cross low enough all can influence the effect of preparing dichloromethane, thereby reation kettle's work efficiency has been reduced, and the current reation kettle who is used for preparing dichloromethane is behind preparation dichloromethane, contain the gaseous direct exposure of volatile dichloromethane in the air in the reation kettle, because dichloromethane is gaseous itself has the toxicity, can seriously influence operating personnel's life health, the problem of danger coefficient has been promoted.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a temperature regulation apparatus for dichloromethane reation kettle, includes the reation kettle main part, the reation kettle main part includes reation kettle shell and reation kettle inner shell, the upper surface intercommunication of reation kettle main part has the inlet pipe that has the valve, the lower surface intercommunication of reation kettle main part has the discharging pipe that has the choke valve, the last fixed surface of reation kettle main part installs the motor, the output shaft fixedly connected with bull stick of motor, the bottom of bull stick passes the bearing of reation kettle main part upper surface joint and extends to the inside of reation kettle main part, the outer fixed surface of bull stick installs a plurality of stirring vane, fixed mounting has the heating plate on the internal face of reation kettle main part.

By adopting the scheme, when the temperature in the reaction kettle is reduced by injecting cold water into the circulating water pipe through the adjusting component, the water inlet pipe with the one-way throttle valve II can be closed, the water outlet pipe with the one-way throttle valve I can be opened, the piston is driven by the electric push rod to move up and down, the cold water in the water storage tank is input into the circulating water pipe by using the air pressure difference to cool the main body of the reaction kettle, the electric push rod is adjusted to adjust the volume of the cold water input into the circulating water pipe, thereby being convenient for adjusting the temperature in the reaction kettle main body, when the water reaches the normal temperature, the water inlet pipe with the one-way throttle valve II can be opened and the water outlet pipe with the one-way throttle valve I can be closed, the water in the circulating water pipe is returned to the water storage tank again for cooling so as to facilitate subsequent secondary cooling, the operation is simple, the use is convenient, and the temperature of the reaction kettle is convenient to adjust; through being provided with gaseous purifying box, utilize air exhauster cooperation suction head can be with the gaseous absorption of dichloromethane to gaseous purifying box interior of volatilizing in the reation kettle main part, cooperation activated carbon plate adsorbs the interior noxious material of dichloromethane gas, thereby the clean gas of discharge, cooperation dismouting subassembly, utilize the cutting to conveniently insert in the slot, the change is dismantled to activated carbon plate's convenience to cooperation T template realization, thereby guarantee the adsorption effect to dichloromethane gas, thereby operating personnel's life safety has been ensured, reation kettle's security has been promoted.

As a preferred embodiment, the left surface fixed mounting of reation kettle main part has the storage water tank, the inside fixed mounting of storage water tank has the condenser pipe, the lower surface of storage water tank communicates respectively has the outlet pipe that has one-way choke valve one and the inlet tube that has one-way choke valve two, annular installation has circulating pipe between reation kettle shell and the reation kettle inner shell, the one end of outlet pipe and inlet tube all passes the reation kettle shell and is linked together with circulating pipe, the last fixed surface of storage water tank installs the regulating box, be provided with adjusting part in the regulating box, adjusting part is assembled for being used for with the adjustable to arbitrary volume of cold water in the storage water tank and carry to the circulating pipe in to realize the temperature in the adjustable reation kettle main part.

Adopt above-mentioned scheme, through being provided with the storage water tank to cooperation inlet tube and inlet tube can be with cold water input circulating water intraductally, in order to reach the temperature to in the reation kettle main part and adjust in order to realize the temperature regulation to the reation kettle main part.

As a preferred embodiment, the adjusting assembly comprises an electric push rod and a piston, the electric push rod is fixedly installed on the inner top wall of the adjusting box, an output shaft of the electric push rod is fixedly connected with the piston, the piston is hermetically and slidably installed inside the adjusting box, and the lower surface of the adjusting box is communicated with the water storage tank through a pipeline.

Adopt above-mentioned scheme, through being provided with electric putter, utilize electric putter adjustable input circulating water pipe cold water's capacity to can be convenient for adjust reation kettle main part internal temperature, can open the inlet tube that has one-way choke valve two and close the inlet tube that has one-way choke valve two when water to normal atmospheric temperature, make the water in the circulating water pipe return again to the storage water tank in cool off so that subsequent cooling once more, easy operation, convenient to use has realized the convenient regulation to reation kettle's temperature.

As a preferred embodiment, the right flank fixed mounting of reation kettle main part has gaseous purifying box, the upper surface intercommunication of gaseous purifying box has the intake pipe, the one end of intake pipe is passed the right flank of reation kettle main part and is extended to the inside of reation kettle main part, fixed mounting has a plurality of suction head on the pipeline section of intake pipe, the lower surface intercommunication of gaseous purifying box has the blast pipe, fixed mounting has the air exhauster in the pipeline section of blast pipe, the inside of gaseous purifying box has the activated carbon board through dismouting subassembly demountable installation.

Adopt above-mentioned scheme, through being provided with gaseous purifying box, utilize air exhauster cooperation suction head can be with the dichloromethane gas absorption of volatilizing in the reation kettle main part to gaseous purifying box in, the cooperation active carbon board adsorbs the interior noxious material of dichloromethane gas to the clean gas of discharge has ensured operating personnel's life safety.

In the above scheme, it should be noted that the motor, the heating plate, the electric push rod and the exhaust fan are all electrically connected with an external power supply.

As a preferred embodiment, the dismouting subassembly includes cutting, T template and bolt, cutting fixed mounting is at the left surface of activated carbon plate, the internal face left side of gas purification case seted up with cutting assorted slot, T template fixed mounting is at the right flank of activated carbon plate, the one end joint of T template is in the passageway of seting up on the gas purification case right flank, the bolt passes the through-hole and the threaded connection of seting up on the gas purification case right flank of seting up on the T template and in the screw hole.

By adopting the scheme, the inserting strip is arranged, and the inserting strip is inserted into the slot to be matched with the T-shaped plate, so that the activated carbon plate can be conveniently detached and replaced, and the adsorption effect on dichloromethane gas is ensured.

As a preferred embodiment, sliding strips are fixedly mounted on the front side surface and the rear side surface of the activated carbon plate, and sliding grooves matched with the sliding strips are formed in the front side surface and the rear side surface of the inner wall surface of the gas purification box.

By adopting the scheme, the sliding strip is driven to slide in the sliding groove through the activated carbon plate, and the sliding strip and the sliding groove are utilized to support and limit the activated carbon plate, so that the activated carbon plate can be more conveniently disassembled and replaced, and the working efficiency is improved.

Compared with the prior art, the beneficial effects of the utility model are that:

the temperature adjusting device for the dichloromethane reaction kettle is provided with the adjusting component, when cold water is needed to be injected into the circulating water pipe to cool the temperature in the reaction kettle, the water inlet pipe with the one-way throttle valve II can be closed, the water outlet pipe with the one-way throttle valve I can be opened, the piston is driven by the electric push rod to move up and down, the cold water in the water storage tank is input into the circulating water pipe by using the air pressure difference to cool the main body of the reaction kettle, the electric push rod is adjusted to adjust the volume of the cold water input into the circulating water pipe, thereby being convenient for adjusting the temperature in the reaction kettle main body, when the water reaches the normal temperature, the water inlet pipe with the one-way throttle valve II can be opened and the water outlet pipe with the one-way throttle valve I can be closed, the water in the circulating water pipe is returned to the water storage tank again for cooling so as to facilitate subsequent secondary cooling, the operation is simple, the use is convenient, and the temperature of the reaction kettle is convenient to adjust;

this a temperature regulation apparatus for dichloromethane reation kettle is through being provided with gaseous purifying box, utilize air exhauster cooperation suction head can be with the gaseous absorption of dichloromethane to gaseous purifying box interior of volatilizing in the reation kettle main part, the cooperation activated carbon plate adsorbs the interior noxious material of dichloromethane gas, thereby the clean gas of discharge, cooperation dismouting subassembly, utilize the cutting to conveniently insert in the slot, the convenient dismantlement of cooperation T template realization to the activated carbon plate is changed, thereby guarantee the adsorption effect to dichloromethane gas, thereby operating personnel's life safety has been ensured, reation kettle's security has been promoted.

Drawings

Fig. 1 is a schematic structural view of a front view section of the present invention;

FIG. 2 is a schematic structural view of a right-side section of the gas purification box of the present invention;

fig. 3 is a schematic structural view of the activated carbon plate of the present invention;

fig. 4 is an enlarged schematic structural diagram of a position a of the present invention.

In the figure: 1. a reaction kettle main body; 2. a reaction kettle shell; 3. inner shell of the reaction kettle; 4. a feed pipe; 5. a discharge pipe; 6. a motor; 7. a rotating rod; 8. a stirring blade; 9. a heating plate; 10. a water storage tank; 11. a condenser tube; 12. a water outlet pipe; 13. a water inlet pipe; 14. a circulating water pipe; 15. an adjusting box; 16. an electric push rod; 17. a piston; 18. a pipeline; 19. a gas purification tank; 20. an air inlet pipe; 21. an air suction head; 22. an exhaust pipe; 23. an exhaust fan; 24. an activated carbon plate; 25. cutting; 26. a slot; 27. a T-shaped plate; 28. a bolt; 29. a slide bar; 30. a chute.

Detailed Description

The present invention will be further described with reference to the following examples.

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The condition in the embodiment can be further adjusted according to concrete condition the utility model discloses a it is right under the design prerequisite the utility model discloses a simple improvement of method all belongs to the utility model discloses the scope of claiming.

Referring to fig. 1-4, the utility model provides a temperature regulating device for a dichloromethane reaction kettle, which comprises a reaction kettle main body 1, wherein the reaction kettle main body 1 comprises a reaction kettle outer shell 2 and a reaction kettle inner shell 3, the upper surface of the reaction kettle main body 1 is communicated with a feeding pipe 4 with a valve, the lower surface of the reaction kettle main body 1 is communicated with a discharging pipe 5 with a throttle valve, the upper surface of the reaction kettle main body 1 is fixedly provided with a motor 6, an output shaft of the motor 6 is fixedly connected with a rotating rod 7, the bottom of the rotating rod 7 passes through a bearing clamped on the upper surface of the reaction kettle main body 1 and extends into the reaction kettle main body 1, the outer surface of the rotating rod 7 is fixedly provided with a plurality of stirring blades 8, the inner wall surface of the reaction kettle main body 1 is fixedly provided with a heating plate 9, the left side surface of the reaction kettle main body 1 is fixedly provided with a water storage tank 10, the inside of the water storage tank 10 is fixedly provided with a condensing pipe 11, the lower surface of the water storage tank 10 is respectively communicated with a water outlet pipe 12 with a one-way throttle valve I and a water inlet pipe 13 with a one-way throttle valve II, a circulating water pipe 14 is annularly arranged between the reaction kettle outer shell 2 and the reaction kettle inner shell 3, one end of the water outlet pipe 12 and one end of the water inlet pipe 13 both penetrate through the reaction kettle outer shell 2 and are communicated with the circulating water pipe 14, the upper surface of the water storage tank 10 is fixedly provided with an adjusting box 15, an adjusting component is arranged in the adjusting box 15, the adjusting component is assembled to adjust the amount of cold water in the water storage tank 10 to any amount and convey the cold water to the circulating water pipe 14, therefore, the temperature in the reaction kettle main body 1 can be adjusted, the adjusting assembly comprises an electric push rod 16 and a piston 17, the electric push rod 16 is fixedly arranged on the inner top wall of the adjusting box 15, an output shaft of the electric push rod 16 is fixedly connected with the piston 17, the piston 17 is hermetically and slidably arranged in the adjusting box 15, and the lower surface of the adjusting box 15 is communicated with the water storage tank 10 through a pipeline 18; by arranging the adjusting component, when cold water needs to be injected into the circulating water pipe 14 to cool the temperature in the reaction kettle, the water inlet pipe 13 with the one-way throttle valve II can be closed, the water outlet pipe 12 with the one-way throttle valve I can be opened, the piston 17 is driven by the electric push rod 16 to move up and down, the cold water in the water storage tank 10 is input into the circulating water pipe 14 by using the air pressure difference to cool the reaction kettle body 1, the capacity of the cold water input into the circulating water pipe 14 can be adjusted by adjusting the electric push rod 16, thereby being convenient for adjusting the temperature in the reaction kettle main body 1, when the water reaches the normal temperature, the water inlet pipe 13 with the one-way throttle valve II can be opened and the water outlet pipe 12 with the one-way throttle valve I can be closed, the water in the circulating water pipe 14 is returned to the water storage tank 10 again to be cooled so as to facilitate subsequent secondary cooling, the operation is simple, the use is convenient, and the convenient adjustment of the temperature of the reaction kettle is realized.

A gas purification box 19 is fixedly installed on the right side surface of the reaction kettle main body 1, the upper surface of the gas purification box 19 is communicated with a gas inlet pipe 20, one end of the gas inlet pipe 20 penetrates through the right side surface of the reaction kettle main body 1 and extends into the reaction kettle main body 1, a plurality of suction heads 21 are fixedly installed on the pipe section of the gas inlet pipe 20, the lower surface of the gas purification box 19 is communicated with an exhaust pipe 22, an exhaust fan 23 is fixedly installed on the pipe section of the exhaust pipe 22, and an activated carbon plate 24 is detachably installed in the gas purification box 19 through a dismounting assembly; through being provided with gaseous purifying box 19, utilize air exhauster 23 cooperation suction head 21 can be with the gaseous absorption of volatile dichloromethane to gaseous purifying box 19 in the reation kettle main part 1, cooperate active carbon plate 24 to adsorb the interior noxious material of dichloromethane gas to the clean gas of discharge, thereby ensured operating personnel's life safety.

The dismounting assembly comprises an inserting strip 25, a T-shaped plate 27 and a bolt 28, the inserting strip 25 is fixedly arranged on the left side face of the activated carbon plate 24, a slot 26 matched with the inserting strip 25 is formed in the left side of the inner wall face of the gas purification box 19, the T-shaped plate 27 is fixedly arranged on the right side face of the activated carbon plate 24, one end of the T-shaped plate 27 is clamped in a channel formed in the right side face of the gas purification box 19, and the bolt 28 penetrates through a through hole formed in the T-shaped plate 27 and is in threaded connection with a threaded hole formed in the right side face of the gas purification box 19; through being provided with the cutting 25, thereby utilize the cutting 25 to insert slot 26 fit T type board 27 in can realize the convenient dismantlement of activated carbon plate 24 and change to guarantee the adsorption effect to dichloromethane gas.

Sliding strips 29 are fixedly arranged on the front side surface and the rear side surface of the activated carbon plate 24, and sliding grooves 30 matched with the sliding strips 29 are formed in the front side surface and the rear side surface of the inner wall surface of the gas purification box 19; the slide bar 29 is driven by the activated carbon plate 24 to slide in the sliding groove 30, and the activated carbon plate 24 is supported and limited by the slide bar 29 and the sliding groove 30, so that the activated carbon plate 24 can be more conveniently detached and replaced, and the working efficiency is improved

When the device is used, a valve is opened to add raw materials into the reaction kettle main body 1 through the feeding pipe 4, the valve is closed after the feeding is finished, the starting motor 6 is matched with the rotating rod 7 to drive the stirring blade 8 to rotate so as to fully stir and mix the raw materials, the effect of promoting the reaction of the raw materials by matching with the heating sheet 9 is achieved, when the temperature in the reaction kettle main body 1 is overhigh, the water outlet pipe 12 of the one-way throttle valve is opened, the electric push rod 16 is started to drive the piston 17 to reciprocate up and down, the generated air pressure difference drives the cold water in the water storage tank 10 to enter the circulating water pipe 14, so that the cold water in the circulating water pipe 14 is neutralized with the high heat in the reaction kettle main body 1 so as to reduce the temperature in the reaction kettle main body 1, the capacity of the cold water input into the circulating water pipe 14 can be controlled by adjusting the electric push rod 16 so as to conveniently adjust the temperature in the reaction kettle main body 1, and when the reaction kettle main body 1 needs to be cooled by inputting the cold water into the circulating water for multiple times, the water outlet pipe 12 of the one-way throttle valve I can be closed, the water inlet pipe 13 with the one-way throttle valve II can be opened, the air pressure difference generated by the up-and-down reciprocating motion of the piston 17 driven by the electric push rod 16 drives the water with the temperature returned in the circulating water pipe 14 to flow back to the water storage tank 10, the water is cooled through the condensing pipe 11 to form cold water again so as to facilitate the next cooling, the prepared dichloromethane flows out from the discharge pipe 5 by opening the throttle valve, meanwhile, the exhaust fan 23 is matched with the suction head 21 to absorb the toxic dichloromethane gas volatilized in the reaction kettle body 1 into the gas purification box 19, the activated carbon plate 24 is matched to absorb the toxic dichloromethane gas, clean gas is discharged through the exhaust pipe 22, when the activated carbon plate 24 needs to be disassembled and replaced, the bolt 28 is unscrewed, and the T-shaped plate 27 is pulled rightwards to enable the insertion strip 25 to be separated from the slot 26, so that the activated carbon plate 24 is conveniently disassembled and replaced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A temperature regulation apparatus for a dichloromethane reaction kettle is characterized in that: the reaction kettle comprises a reaction kettle main body (1), wherein the reaction kettle main body (1) comprises a reaction kettle outer shell (2) and a reaction kettle inner shell (3), the upper surface of the reaction kettle main body (1) is communicated with a feeding pipe (4) with a valve, and the lower surface of the reaction kettle main body (1) is communicated with a discharging pipe (5) with a throttling valve;

last fixed surface of reation kettle main part (1) installs motor (6), the output shaft fixedly connected with bull stick (7) of motor (6), the bottom of bull stick (7) passes the bearing of reation kettle main part (1) upper surface joint and extends to the inside of reation kettle main part (1), the fixed surface of bull stick (7) installs a plurality of stirring vane (8), fixed mounting has heating plate (9) on the internal face of reation kettle main part (1).

2. The temperature regulation device for dichloromethane reaction kettle according to claim 1, characterized in that: the left side face of the reaction kettle main body (1) is fixedly provided with a water storage tank (10), the inside of the water storage tank (10) is fixedly provided with a condenser pipe (11), the lower surface of the water storage tank (10) is respectively communicated with a water outlet pipe (12) with a one-way throttle valve I and a water inlet pipe (13) with a one-way throttle valve II, a circulating water pipe (14) is annularly arranged between a reaction kettle outer shell (2) and a reaction kettle inner shell (3), one end of the water outlet pipe (12) and one end of the water inlet pipe (13) penetrate through the reaction kettle outer shell (2) and are communicated with the circulating water pipe (14), the upper surface of the water storage tank (10) is fixedly provided with an adjusting box (15), an adjusting component is arranged in the adjusting box (15), and is assembled to be used for adjusting cold water in the water storage tank (10) to any amount and conveying the cold water to the circulating water pipe (14), thereby realizing the temperature adjustment in the reaction kettle main body (1).

3. The temperature regulation device for a dichloromethane reaction kettle according to claim 2, characterized in that: the adjusting assembly comprises an electric push rod (16) and a piston (17), the electric push rod (16) is fixedly installed on the inner top wall of the adjusting box (15), an output shaft of the electric push rod (16) is fixedly connected with the piston (17), the piston (17) is installed inside the adjusting box (15) in a sealing and sliding mode, and the lower surface of the adjusting box (15) is communicated with the water storage tank (10) through a pipeline (18).

4. The temperature regulation device for dichloromethane reaction kettle according to claim 1, characterized in that: the right flank fixed mounting of reation kettle main part (1) has gaseous purifying box (19), the upper surface intercommunication of gaseous purifying box (19) has intake pipe (20), the one end of intake pipe (20) is passed the right flank of reation kettle main part (1) and is extended to the inside of reation kettle main part (1), fixed mounting has a plurality of suction head (21) in the pipeline section of intake pipe (20), the lower surface intercommunication of gaseous purifying box (19) has blast pipe (22), fixed mounting has air exhauster (23) in the pipeline section of blast pipe (22), there is activated carbon plate (24) in the inside of gaseous purifying box (19) through dismouting subassembly demountable installation.

5. The temperature regulation device for dichloromethane reaction kettle according to claim 4, characterized in that: the dismouting subassembly is including cutting (25), T template (27) and bolt (28), cutting (25) fixed mounting is at the left surface of activated carbon plate (24), internal face left side of gas purification case (19) is seted up with cutting (25) assorted slot (26), T template (27) fixed mounting is at the right flank of activated carbon plate (24), the one end joint of T template (27) is in the passageway of seting up on gas purification case (19) right flank, bolt (28) pass through-hole and the threaded connection of seting up on T template (27) in the threaded hole of seting up on gas purification case (19) right flank.

6. The temperature regulation device for dichloromethane reaction kettle according to claim 4, characterized in that: sliding strips (29) are fixedly mounted on the front side face and the rear side face of the activated carbon plate (24), and sliding grooves (30) matched with the sliding strips (29) are formed in the front side face and the rear side face of the inner wall face of the gas purification box (19).